package com.utils;


import javax.servlet.http.HttpServletRequest;

public class IpUtil {

	 /** 
	   * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
	   * 
	   * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 
	   * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
	   * 
	   * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
	   * 192.168.1.100 
	   * 
	   * 用户真实IP为： 192.168.1.110 
	   * 
	   * @param request 
	   * @return 
	   */ 
	  public static String getIpAddress(HttpServletRequest request) {
	    String ip = request.getHeader("x-forwarded-for");
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			  ip = request.getHeader("WL-Proxy-Client-IP");
		  }
		  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			  ip = request.getHeader("HTTP_CLIENT_IP");
		  }
		  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			  ip = request.getHeader("HTTP_X_FORWARDED_FOR");
			  System.out.println("============ips:"+ip);
		  }
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getRemoteAddr();
	    }

		  if(ip != null && !"".equals(ip)){
			  String[] ips = ip.split(",");
			  if(ips.length > 0 ){
				  for(int i = 0 ; i < ips.length ; i++){
					  if(!"unknown".equalsIgnoreCase(ips[i])){
						  ip = ips[i];
						  break;
					  }
				  }
			  }
		  }

	    return ip; 
	  }
	/*
	 * 验证IP是否属于某个IP段
	 * 
	 * 
	 * 
	 * ipSection IP段（以'-'分隔）
	 * 
	 * ip 所验证的IP号码
	 */

	public static boolean ipExistsInRange(String ip, String ipSection) {

		ipSection = ipSection.trim();

		ip = ip.trim();

		int idx = ipSection.indexOf('-');

		String beginIP = ipSection.substring(0, idx);

		String endIP = ipSection.substring(idx + 1);

		return getIp2long(beginIP) <= getIp2long(ip) && getIp2long(ip) <= getIp2long(endIP);

	}

	public static long getIp2long(String ip) {

		ip = ip.trim();

		String[] ips = ip.split("\\.");

		long ip2long = 0L;

		for (int i = 0; i < 4; ++i) {

			ip2long = ip2long << 8 | Integer.parseInt(ips[i]);

		}

		return ip2long;

	}

	public static long getIp2long2(String ip) {

		ip = ip.trim();

		String[] ips = ip.split("\\.");

		long ip1 = Integer.parseInt(ips[0]);

		long ip2 = Integer.parseInt(ips[1]);

		long ip3 = Integer.parseInt(ips[2]);

		long ip4 = Integer.parseInt(ips[3]);

		long ip2long = 1L * ip1 * 256 * 256 * 256 + ip2 * 256 * 256 + ip3 * 256 + ip4;

		return ip2long;

	}

	public static void main(String[] args) {

		// 10.10.10.116 是否属于固定格式的IP段10.10.1.00-10.10.255.255

		String ip = "10.10.265.116";

		String ipSection = "10.10.1.00-10.10.255.255";

		boolean exists = ipExistsInRange(ip, ipSection);

		System.out.println(exists);

		System.out.println(getIp2long(ip));

		System.out.println(getIp2long2(ip));

	}
}
